Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cc071b29a9bd63…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 12:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f1bef7901a48b0ba122c1c5a5b8a2b2 SHA-1: 6583dbfb7cd874177751cfdd22cfcda967f2f771 SHA-256: 22cc071b29a9bd63afbcd322c896d6826ddb9e369d5c18f60ed79626763e31a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vietnaminsight.biz/ckfinder/userfiles/files/vivosazapijera.pdf
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/36426530885.pdf
    • http://kodemari.info/data/files/51883761712.pdf
    • https://aadharshilaschool.org/userfiles/file/31798599558.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/r7rnm8eor5f2pst1kt76mskj2m/39521809099.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/b622c7b6174dba79fe617ba0aa0550c5/fanemorutarowebigisowir.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/6837989442d61818ae9c05cc8f1865d8/podezesoriromabuxaliluz.pdf
    • http://hakkabrothers.com/userfiles/file///25909826109.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/5f192bbb4776f376894e8c43fae4f1e1/70563945524.pdf
    • https://ofertaromania.ro/ckfinder/userfiles/files/rujolurifefisoniw.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/81e600ec2828c3a04ce9c6b0b2668074/tepazadagejija.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/5e7578e73d8075d6d3aaa279b2639a47/27522245864.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/keduviwodofometikenizoj.pdf
    • http://www.examnotice.in/uploads/files/xuxifeluwu.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa95840ece1---rolebifuzafiron.pdf
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/27157160031.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9a0cbd58---7271961828.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/1b2e10be84dc0fcf6fa6cfa6c51a54ce/furozafezi.pdf
    • http://odontotecnicacoop.it/userfiles/file/70233078743.pdf
    • https://performanshost.com/calisma2/files/uploads/46871381596.pdf
    • http://mientaytourist.com/uploads/files/nawudulavidirevagareze.pdf
    • http://hidra.it/ckfinder/userfiles/files/satimupumarotujike.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=griffin+y+moorhead+comportamiento+organizacional+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF7 16792 bytes
font_01_sfnt_off0000e409.bin
94746197edc3aa670dd0d8ba10e9b52b04da306cd296a85217acd92925bca3db
pdf-font-stream PDF embedded font (sfnt) at offset 0xE409 19232 bytes
font_02_sfnt_off000114ae.bin
3b32ec6e10a779682040804fbabf6820b325eea90d4033dbf2968f934583a522
pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 11112 bytes